linux-kernel - Re: [syzbot] WARNING in follow_hugetlb

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Message-ID: <75f09063-d184-7d44-17a1-ed04be5eb953@oracle.com>
Date:   Fri, 13 May 2022 11:09:47 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        syzbot <syzbot+acf65ca584991f3cc447@...kaller.appspotmail.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        llvm@...ts.linux.dev, nathan@...nel.org, ndesaulniers@...gle.com,
        syzkaller-bugs@...glegroups.com, trix@...hat.com,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [syzbot] WARNING in follow_hugetlb_page

On 5/13/22 10:26, Andrew Morton wrote:
> On Fri, 13 May 2022 09:43:24 -0700 syzbot <syzbot+acf65ca584991f3cc447@...kaller.appspotmail.com> wrote:
> 
>> syzbot has found a reproducer for the following issue on:
> 
> Thanks.
> 
>> HEAD commit:    1e1b28b936ae Add linux-next specific files for 20220513
>> git tree:       linux-next
>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=174ae715f00000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=e4eb3c0c4b289571
>> dashboard link: https://syzkaller.appspot.com/bug?extid=acf65ca584991f3cc447
>> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11531766f00000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16ce5a9ef00000
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+acf65ca584991f3cc447@...kaller.appspotmail.com
>>
>> ------------[ cut here ]------------
>> WARNING: CPU: 1 PID: 3611 at mm/hugetlb.c:6250 follow_hugetlb_page+0x1326/0x1c80 mm/hugetlb.c:6250
> 
> The try_grab_folio() added by 822951d84684d ("mm/hugetlb: Use
> try_grab_folio() instead of try_grab_compound_head()").  That commit
> has been there over a month so I guess it's something else.  Does
> someone have the time to bisect?

I can recreate in my 'easy to debug' environment, so I can bisect in
parallel with other things I need to do today.

If someone else has dedicated time and resources, feel free.  You may
beat me to the answer.
-- 
Mike Kravetz